Lock



C. HOFFMAN.

LOCK.

AFPLICATIGN FlLED JULY 16, 1920.

PatentedAug. 23, 1921.

Caf /foflgmamr/V w1, we fw UNITED STATES PATENT oFFlcE. i

LOCK.

Application ined July 1s,

To all whom tmay concern:

Be it known that I, CARL HOFFMAN, of

"Allentown, in kthe `county of Lehigh and State of Pennsylvania, haveinvented certain new and useful Improvements in Locks; and I do herebydeclare the following to be a full, clear, and exact `description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the` same.

My invention relates to locks and is of the type where the locking andlatching functions are effected by a single member on the doorcooperating withV a keeper on the door casing. The object of myinvention is to provide a simple and highly eilicient lock with but aminimum number of parts which are so arranged that the lock-latch isreadily operable from inside and outside the door by means of a handledspindle; may be locked on the inside to, prevent manipulation `fromwithout; may be locked from outside by means ofV a key which sets acontrol mechanism so that the lock-latch may not bemoved save by anappropriate key which must first be turned to dislodge a stop fromlocking engagement with `the lock-latch lever and then be brought intoengagement with a tumbler controlled actuating slide by whichthe lever`is moved to retract the lock-latch. y

`In the drawings, Figure lis a view in perspective oi' a portion of thedoor, viewed from the inside, with my improved lock applied thereto.Fig. 2 is an elevation with one of the casing plates removed to `showthe operating mechanism. Fig. 3 is a detail showing the key cylinder andthe `bit end of the key. Fig. 4 is a side elevation of a portion of theoperatingr lever.

While m improved lock is applicable to any door Iyhave designed itprimarily for use with store doors. A casing 1 with the usual edgeandside plates is mortised in a door and is provided with necessaryopenings for theprojection of the lock-latch 2 and for access to thecontrol mechanism by means of a handle and a key. The lock latch has aninwardly extending portion 3 with a projecting stud 4 with which ahooklike finger 5 of an operating lever 6 is designed to have slidingengagement to retract the loclrlatch against the tension of its spring7. `This lever is of peculiar forma tion. It has tWO arms 8 and 9, thelatter Specification of Letters Patent.

Patented Allg. 23, 1921. 192e. serial No. 396,697.

being longer than thearm 8, the pivotal connection of the lever with thecasing being at the extreme endof the arm 9, as indicated at 10. Acut-out 12 in the arm 9 is adapted to receive a stop block 13 'whichwhen moved into this cut-out effectively prevents any movement of thelever. The stop block has talons 14, 15,` with which the bit of a key isdesigned to engage to raise and lower thestop block, the *latter beingheldin either of its two positions by a spring held tumbler 17 which isin locked engagement with the block, it being neces sary to first movethe tumbler bei-ore the stop block can be actuated. A winged spindle 18operable by appropriate handles 19 on the inside and outside of the dooris one meansfor turning the lever 6 to retract the lock-latch, the wings2() of the spindle engaging the arm 9, as shown in Fig. 2. The arm 8 at`its extreme end carries a hinged plate 21 which forms a continuation ofthe arm. To this plate is secured a lever 22 which is bent so as to liein spaced parallelism with the arm 8, a spring 23 i1i-` terposed4between the lever and arm normally maintaining the plate 21 in the sameplane with the arm 8. A projection 24 on the lever extends `laterallyinto a semi-cir cular recess 25 oi the lever 6 and when movedlongitudinally of the recess will rock the plate 21 and cause it toasume a slightly slanting position relative to the arm 8 so that in thisdeflected position of the plate as indicated in dotted lines, Fig 4, atumbler actuated slide, to be hereinafter described, cannot operativelyengage the plate. For the purpose of moving the lever 22 as justdescribed I employ `a stop pin 26 fricw tionally held in the lock caseand operable from inside the door. This stop pin when moved inward Iirstpresses on the projection 24 oi the lever 22 and then takes in therecess l25 effectively locking' the lever 6 against movement. This stoppin may also be employed to hold the lock-latch permanently retracted,the pin taking` in a recess 27 of the lock-latch for this purpose.

against movement in either direction by Ytumblers 33, Vthe spring 7which cooperates withy the lock Vlatchservingto tension these tumblers.

A cylinder 35fhaving a longitudinal slot V36, extending part kwaythrough the cylinder Y forms the guide for the key 16. At its ini nerend this cylinder carries a hinged finlof the lever 6 andturn theglever.oni-its for actuating a signal to indicate `opening i ofthe door. I havevshown such a connection. in Fig. 2, a bell being 'indicated at 40,

theextensionof the-"leverat 4:1, andrsuit l able gearing at 42. f

In theuse ofy my improved lock, and assuming the parts to be in theposition shown in Fig. 2, turning ofthe spindle 18 from either inside oroutside the door will cause one. of the-wings 20fto engage the Yarm IVOcausing -a retraction of the lockatch V,through engagement of the linger5 with the stud This lmovement is also effective to soundrthe bell throuli the mechanism shown for that purpose. f it be desired to hold thelock-,latch in retracted position -it is only necessary to withdraw itfrom engagement with its keeper by means of the handle, as suggested,and to pushV in on the stol 26so that it will take in the recess 2 andhoild the lock-latch.l against the tension of its spring.- With thelparts in operable posi- 1 tion,'if it is desiredY to secure thelock-latch against manipulation from without the cyl- .inder must firstbe turned so that its slot 36'is at the bottom. The key is then insertedandturned so that itsbit will engage the tumbler 17 to remove it fromlocking Vengagementwith the stop block 13, further turnin of the `keybringing the bit into contact with the talons of the stop block'tomoveit up into the cut-out 12 ofthe arm 9. The key is then withdrawmfbutbefore it is entlrely'removed from the cylinder it may be given aturntoplace the slot of the cylindergin reverse of the'correct position foroperation of the lock. vTorelease the lock- Vlatch from the outside bymeans of theV key,

the cylinder 35 must be positioned with its lslot at the top, the keyinserted and turned so as to move. the tumbler-17 and the fstop block13,the latter from engagement with the 'leverv6, continued turningvofthe key then bringing its bit into :engagement with thetuniblers 33 forunlocking the slide 30 aIidthenf-moving theslide to contapt with Ysecures the lever` 6 against movement.

pin

the plate 21 which causes the turiiin of the leverV 6 and retraction ofthe loc latch. Locking of the parts from within so as t0 prevent any.manipulation from without either by the handle or key is effected bypressing inwardly on the stop pin 26 Whic not only removes the plate 21from position to be engaged by the slide 30 but alo t will beappreciated that even though a key or other instrument may be insertedand the tumbler actuated slide 30 moved its movement is ineffectivesince the plate 21 is deflected from the path of the slide 30.Additional security may be given b turni cylinder 35 and fastening itsnger-ho d 37 on the stud 38.

yI claim as my invention:

1. In a lock, a tensioned lock-latch, an actuating lever therefor, ahandled spindle for operating said lever, tumbler controlled means forengaging .and moving said lever to retract said lock-latch, and atumbler controlled means for locking said lever against movement, incombination with a key for Yeffecting movement of each of said lastmentioned means.

2. In a lock, a tensioned lock-latch, an

.actuating levertherefor, a handled spindle 'Y and said tumblercontrolled slide.

3. In a lock, a tensioned lock-latch, an actuating lever therefor havinga hin portion, a handled spindle for o rating said lever, a tumblercontrolled side for engaging the hinged portion of said lever to retractsaid lock-latch, means for moving said Yhinged portion of the lever fromthe .path of said slide, and a tumbler controlled stop forY locking saidlever against movement, in combination with a key for actuating1 saidstop and said tumbler controlled sli e;

4. In a lock, a tensionedv lock-latch, an actuating lever therefor,having a hinged portion, a handled spindle for operating said lever, atumbler controlled slide for engaging the hinged portion of said leverto retract saidlock-latch, a stop pinfor moving vsaid hinged portion ofthe lever from Vthe pathof said slide, and a tumbler controlled `stopblock for locking said lever against movement, in combination with a keyfor'actuating said stopblock and Said tumbler controlled slide.

5. In a lock, a casing, atensoned locklatch, an actuating lever thereforhaving a.

pair of arms, one of said varms having a hinged portion, and the otherofsaid arms the lever and in part by the casing of the lock 10 for movinsaid hinged portion from the Eath of said slide, in combination with aey for actuating said stop block and said tumbler controlled slide.

In testimony whereof I have signed this 15 specification.

CARL HOFFMAN.

